Optimising the milling of titanium aluminide alloys

Beranoagirre, A.; Lacalle, Luis Norberto López de

doi:10.1504/ijmms.2010.036067

Cited by 13 publications

(21 citation statements)

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“…These trends resulted also in agreement with the results reported by Branoagirre for other gamma-TiAl alloys, manufactured as solidified ingot and extruded after solidification [11,12]. In dry milling, the experimental data for tool life estimation are well fitted by the following full quadratic model (correlation index R=0.99), whose behavior is shown in Fig.…”

Section: Tool Wearsupporting

confidence: 90%

Tool wear and surface quality in milling of a gamma-TiAl intermetallic

Priarone

Rizzuti

Rotella

et al. 2011

Int J Adv Manuf Technol

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Advanced structural materials for high-temperature applications are often required in aerospace and automotive fields. Gamma titanium aluminides, intermetallic alloys that contain less than 60 wt.% of Ti, around 30-35 wt.% of aluminum, and other alloy elements, can be used as an alternative to more traditional materials for thermally and mechanically stressed components in aerospace and automotive engines, since they show an attractive combination of favorable strength-to-weight ratio, refractoriness, oxidation resistance, high elastic modulus, and strength retention at elevated temperatures, together with good creep resistance properties. Unfortunately such properties, along with high hardness and brittleness at room temperature, surface damage, and short and unpredictable tool life, undermine their machinability, so that gamma-TiAl are regarded as difficult to cut materials. A deeper knowledge of their machinability is therefore still required. In this context the paper presents the results of an experimental campaign aimed at investigating the machinability of a gamma titanium aluminide, of aeronautic interest, fabricated via electron beam melting and then thermally treated. Milling experiments have been conducted with varying cutting speed, feed, and lubrication conditions (dry, wet, and minimum quantity lubrication). The results are presented in terms of correlation between cutting parameters and lubrication condition with tool wear, surface hardness and roughness, and chip morphology. Tool life, surface roughness, and chirp morphology showed dependence on the cutting parameters. Lubrication conditions were observed to heavily affect tool wear, and minimum quantity lubrication was shown to be by far the method that allows to extend tool life.

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Section: Tool Wearsupporting

confidence: 90%

Tool wear and surface quality in milling of a gamma-TiAl intermetallic

Priarone

Rizzuti

Rotella

et al. 2011

Int J Adv Manuf Technol

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show abstract

“…In addition, tool flank wear and cutting speed were found to have the greatest effect on residual stress. Beranoagirre and López de Lacalle (2010) presented the results of milling tests on three different types of gamma TiAl alloys: the MoCuSi type in ingot and extruded form, and the TNB type in ingot form. They analyzed the flank wear as a function of cutting time for different cutting conditions, and found that the cutting speed has the main effect on the tool life of hard metal end milling tools.…”

Section: Introductionmentioning

confidence: 99%

Effects of cutting angle, edge preparation, and nano-structured coating on milling performance of a gamma titanium aluminide

Priarone

Rizzuti

Settineri

et al. 2012

Journal of Materials Processing Technology

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“…The interest in machinability of gamma titanium aluminides is still increasing, focussing on milling [14,15], drilling [16] and turning [17][18][19] processes. However, further work is needed to optimize machining strategies leading to high productivity at aerospace quality levels, where surface integrity is indispensable for the in-use component, focusing on tool and process design as well as the development of adapted high performance lubricoolant strategies.…”

Section: Introductionmentioning

confidence: 99%

On high-speed turning of a third-generation gamma titanium aluminide

Klocke

Lung

Arft

et al. 2012

Int J Adv Manuf Technol

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Gamma titanium aluminides are heat resistant intermetallic alloys predestined to be employed in components suffering from high mechanical stresses and thermal loads. These materials are regarded as difficult to cut, so this makes process adaptation essential in order to obtain high quality and defect-free surfaces suitable for aerospace and automotive parts.In this paper an innovative approach for longitudinal external high speed turning of a third generation Ti-Al 45 -Nb 8 -C 0.2 -B gamma titanium aluminide is presented. The experimental campaign has been executed with different process parameters, tool geometries and lubrication conditions. Results are discussed in terms of surface roughness/integrity, chip morphology, cutting forces and tool wear. Experimental evidence showed that, due to the high cutting speed, the high temperatures reached in the shear zone improve chip formation, so crack-free surface can be obtained.Furthermore, the use of a cryogenic lubrication system has been identified in order to reduce the huge tool wear, which represents the main drawback when machining gamma titanium aluminides under the chosen process conditions.

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Optimising the milling of titanium aluminide alloys

Cited by 13 publications

References 0 publications

Tool wear and surface quality in milling of a gamma-TiAl intermetallic

Tool wear and surface quality in milling of a gamma-TiAl intermetallic

Effects of cutting angle, edge preparation, and nano-structured coating on milling performance of a gamma titanium aluminide

On high-speed turning of a third-generation gamma titanium aluminide

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